There is no adjustment, no pull-down spring that I recall.
If you did not bend the copper-ish spring <> With care and luck, you should be able to get the head to load onto the disk surface properly.

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I did that before posting this topic, even putting a weight on the head overnight to keep it bent down. Helped a little bit, I think, but still wasn't enough. I haven't looked at the drives since last weekend, but I know what you are talking about with the copper piece. And I remember thinking to myself, "Is that the thing which pulls down the arm?!" I don't remember if I've creased it or not, so I'll have to take a look. But I'm almost certain I saw something which looked like a spring down below. I'll have to take a closer look.

Thank you for your advice.